Light modulation device and light modulation method
US10090921B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 10, 2015 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Oct 6, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n<m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.